Tire signal



W. A. HARNED July 1,k 1930.

TIRE S IGNAL Filed Aug. so. 1929.

3mm/vbo@ @Homage Patented JulyA 1, `1930 UNITED STATES .PATENT oFEIcEwILroRn A. HARNED, or HELENA, 1,101`Tflui-m-Y TIRE SIGNAL ApplicationElea August .'30, 132s. seriai Navasaoe.

This invention relates to a signal device for use in connection with thetires of motor vehicles whereby, when the pressure falls below or risesabove a predetermined point,

the signal Willbe sounded to give Warning to the user.

Another object is to combine a signal ofY scribed and claimed, it beingunderstood that changes in the precise embodiment of the inventionherein disclosed mayv be made within the scope of what is claimedwithout departing from the spirit of the invention. In the accompanyingdrawing the preferred form of the invention has been shown.

In said drawing,

Figure 1 is a central longitudinal section through the device.

Figure 2 is an enlarged section on line 2 2, Figure 1.

Figure 3 is an enlarged section on line 3--3, Figure l.

Figure 4 is an enlarged section on line 4 4, Figure 1.

Referring to the figures by characters of reference, l designates theeXteriorly screwthreaded casing of a tire valve, the free end portion ofthis casing being reduced and eXteriorly screw-threaded as shown at 2 soas to be coupled in the usual way to a tube for supplying air underpressure. In this reduced end portion of the casing is located the usualvalve 3 adapted to close under pressure from within the tire tube VT.

tion of the casing land has a tubular stem 5 opening therethrough. Aspring 6 extends around this stem and bears at one end against thepiston 4 and at its other end against an I interior shoulder 7 formedinthe casing 1.

A piston 4 is mounted in the inner end por* ter with ka port 11openinginto the passage 10. `This passage has its outlet through ashoulder 12 at the base of the -reduced por-V tion 2 of the valvecasing. A cap 13 is adapted to be placed in engagement with the end ofcasing 1 and this cap constitutes la whistle,

there being a vent 141through whichair, when flowing, will produce awhistling sound. A tire tube is adapted to be inflated in thev usualway, it rstbeing necessary to remove the cap 13.` Air forced into thetube kwill move piston 4outwardly in casing 1 so that port 8 will ybelinterposed betweenl the two' ports'9 and l0 as shown, for example, in Figure vl. Thereafter the cap- 13 is placedjin positionand should the airin the tubekfallA below a predetermined pressure, the spring 6 willactuatepiston 4 so as to slide Vstem 5 and bring port 8 intocommunication with port 9. Thus atip'ortionof the. air in the tube willescapeK through these registering ports into passage 10 and thenceintothe cap 13 from which it will escape with a whistlingvsound. Shouldthepressure in the tire increase, as from expansion due to heat, the piston4 will be pushed outwardly, bringing port 8` into communication withport l1 so that air will escape through these registering ports into thepassage l0 and thence to cap 13 from which it will escape with awhistling sound. Thus the device will act as a signal to notify the usershould pressure in the tire fall below a predetermined amount or riseabove a predetermined amount.

What is claimed is: 1. The combination with the casing of a tire valveand a valve therein adapted to be seated by pressure from within atire,`of a piston in the casing, a tubular stem opening therethrough,yielding means for holding the piston normally in a predeterminedposition, there being a passage having an outlet at one end and spacedinlets, said piston stem constituting a valve for openingY one inlet andclosing the second inlet when the pressure from within a tire risesabove a predetermined point and for closing the first inlet and openingthe second inlet when the pressure in the tire falls below apredetermined point, and a signal `device adapt-ed to be sounded by airescaping from the passage.

l l ,'When'supplied thereto through either inlet.

- 2.` The combination with the oasingofa tirevalve anda vvalve thereinadapted to be normally closed by pressure fromwithin a tire,there beinga passage inthe Wall of said casing having an outlet at onre'end andspaced p inlets atits other end,of apiston inthe casi' i ing, a tubularstemV opening l.therethrough y having' a port,SaidyStem,constitutngavalva forV establishing communication from Withine the Spam witheither of the miens of mapas-;;

sage,. yielding :means fory restraining the Y r movement `of the pistonAand.A its pin under pressure from Within a tire, and a signal deviceadapted tombe sounded byair issuing from the passage( 3.The"cornbination with the casingof a gojtire'valye and avalvethereii'i`adapted to be p :normally Closed by pressure :froid Within atire,{saidjcasing"y having ak passage therein p'royidedlwthanoutletfandsp'aoed inlets,V of

'yieldinglye restrained piston in the casing,`

25 altubular stem openingctherethrongh,having.

a portl normally positioned y between the in- L, y lets,` said pistonbeing shiftable by variations Y ofl pressure, to bring said port intofcolnifnu-` nieation ,with one 'org` thefother I of 'the :inletsandgestablishing communication betiieen the passage and` the interior"of thelvv'alye, and a signaldevic'e adaptedqto `be sounded air' issuingfromthepzfissage,Y`

` Irly1v own, Ijliayehretd alXedim y signature.:`

